Graphene, single atomic layer of two dimensional honeycomb carbon lattice, has attracted great attention for various application such as field-effect transistors (FETs), chemical or biological sensors, flexible electronic devices due to outstanding thermal conductivities, high transparency, tunable ...
Graphene, single atomic layer of two dimensional honeycomb carbon lattice, has attracted great attention for various application such as field-effect transistors (FETs), chemical or biological sensors, flexible electronic devices due to outstanding thermal conductivities, high transparency, tunable band gap and electrical properties. So, the specific challenge of integrating graphene into such devices, patterning methodology should be developed. Lithography, the well-known fabricating techniques by top-down process, has been widely used to produce graphene patterns for electronic devices but suffers from several issues including low throughout put, high costunnecessary dissipation be created. Therefore altenative technology that the pattern produced is suggested. In this study, graphene pattern formation of two methods have experimentally conducted by self-assembly process of controlled solvent evaporation. The principle of self-assembly is based on the so-called "Coffee Ring" effect, in which nonvolatile solutes are carried to the pinned droplet edge by outward flowing of solutions from the interior to the edge. On the first experiment, CVD grown graphene was patterned via self-assembly of polymer blend solution i.e., polystyrene-poly(methyl methacrylate). Phase separation phenomena of polymer blend that play a key role in the pattern formation of CVD graphene. The resulted specific micro-patterned graphene thin films may be used in active channel for thin film transistor. In the following section, gold nanoparticle decorated individual graphene oxide nanosheets were self-organized by guidance with polymer patterns formed on silicon substrate. Then, single stranded DNA that modified with thiol-groups was simply immobilized on patterned graphene surfaces. This result implies that the patterned graphene oxide decorated by gold nanoparticle may serve as a possible sensing platform for biologically active surfaces to study surface-enhanced Raman scattering (SERS).
Graphene, single atomic layer of two dimensional honeycomb carbon lattice, has attracted great attention for various application such as field-effect transistors (FETs), chemical or biological sensors, flexible electronic devices due to outstanding thermal conductivities, high transparency, tunable band gap and electrical properties. So, the specific challenge of integrating graphene into such devices, patterning methodology should be developed. Lithography, the well-known fabricating techniques by top-down process, has been widely used to produce graphene patterns for electronic devices but suffers from several issues including low throughout put, high costunnecessary dissipation be created. Therefore altenative technology that the pattern produced is suggested. In this study, graphene pattern formation of two methods have experimentally conducted by self-assembly process of controlled solvent evaporation. The principle of self-assembly is based on the so-called "Coffee Ring" effect, in which nonvolatile solutes are carried to the pinned droplet edge by outward flowing of solutions from the interior to the edge. On the first experiment, CVD grown graphene was patterned via self-assembly of polymer blend solution i.e., polystyrene-poly(methyl methacrylate). Phase separation phenomena of polymer blend that play a key role in the pattern formation of CVD graphene. The resulted specific micro-patterned graphene thin films may be used in active channel for thin film transistor. In the following section, gold nanoparticle decorated individual graphene oxide nanosheets were self-organized by guidance with polymer patterns formed on silicon substrate. Then, single stranded DNA that modified with thiol-groups was simply immobilized on patterned graphene surfaces. This result implies that the patterned graphene oxide decorated by gold nanoparticle may serve as a possible sensing platform for biologically active surfaces to study surface-enhanced Raman scattering (SERS).
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